Globe and Mail: Proposed U.S. legislation could slap import levies on a range of Canadian products – from steel and cement to paper and ceramics – if Washington deems Canada is lax in fighting global warming. The climate change legislation also includes low-carbon standards that could drive up the cost of imports from the Alberta oil sands. Leading Democrats in the U.S. Congress this week introduced a bill to cap greenhouse gas emissions that would require the administration to impose …